High Fidelity Qubit Readout with the Superconducting Low-Inductance Undulatory Galvanometer Microwave Amplifier
arXiv:1312.7579 · doi:10.1063/1.4871088
Abstract
We describe the high fidelity dispersive measurement of a superconducting qubit using a microwave amplifier based on the Superconducting Low-inductance Undulatory Galvanometer (SLUG). The SLUG preamplifier achieves gain of 19 dB and yields a signal-to-noise ratio improvement of 9 dB over a state-of-the-art HEMT amplifier. We demonstrate a separation fidelity of 99% at 700 ns compared to 59% with the HEMT alone. The SLUG displays a large dynamic range, with an input saturation power corresponding to 700 photons in the readout cavity.
10 pages, 3 figures
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Cited by in corpus (10)
- Building logical qubits in a superconducting quantum computing system
- Tunable Superconducting Qubits with Flux-Independent Coherence
- Quantum--Classical Interface Based on Single Flux Quantum Digital Logic
- Optimal dispersive readout of a spin qubit with a microwave resonator
- Active protection of a superconducting qubit with an interferometric Josephson isolator
- Enhancing qubit readout through dissipative sub-Poissonian dynamics
- Implementing generalized measurements with superconducting qubits
- High fidelity single-shot readout of a transmon qubit using a SLUG μwave amplifier
- Reverse isolation and backaction of the SLUG microwave amplifier
- Utilization of the Superconducting Transition for Characterizing Low-Quality-Factor Superconducting Resonators